I love this whole series! You don't have to read the undergrad years, like at all, but I am so glad that I did read them before I read this, just because I felt like I was a part of the group and I knew some of their secrets. This is like a soap opera and I can see it playing in my mind as I am reading these books. Unsaid is Blake's story and I just LOVE Blake so much, I feel like he is the most fragile one of the Manhattanites and the girls are so protective of him, I just love their little group. I was so sad though after reading XO, Blake then to read Unsaid and see how his relationship turned out, but it DEFINATELY worked out the way it was supposed to in the end. I totally recommend this book to all those who are non-prudish and not a slut-shamer.